rich:calender not updating backing bean

[chakri_jboss]

hii all,

my problem is , when a calender value is changed i am firing an a4j: event and going for validation in bakcing bean methods. but they raise null pointer exception.

my code is,

                     <rich:calendar datePattern="dd/MM/yyyy" value="#{registrationFormBean.fromDate}" />
                   
                    <rich:calendar datePattern="dd/MM/yyyy" value="#{registrationFormBean.toDate}">
                    <a4j:support event="onchanged" action="countNumberOfDays" reRender="daysofleave" ajaxSingle="true"/>
                    </rich:calendar>

                    <h:outputLabel for="daysofleave" value="Number of Days:"/>
                    <a4j:region>
                    <h:inputText id="daysofleave"  value="#{numberOfDays}" ajaxRendered="true"/>
                    </a4j:region>

so when i run this page it gives out Null pointer exception saying {registrationFormBean} maps to a null value.

please some known of this help me.

[amarkhel]

You should post you stacktrace and full page code.

Anyway, 1. <h:inputText id="daysofleave"  value="#{numberOfDays}" ajaxRendered="true"/> h:inputText haven't attribbute ajaxRendered.

2. <a4j:support event="onchanged" action="countNumberOfDays" reRender="daysofleave" ajaxSingle="true"/> After click event rerendered only your h:inputText, it is wrong your must rerender some container. like this :

<a4j:region id="daysofleave">
                    <h:inputText value="#{numberOfDays}" ajaxRendered="true"/>
</a4j:region>

3. You clearly understand why you use ajaxSingle="true" attribbute? What will be if remove this attribbute?